Abstract: With support of virtual reality technology，SolidWorks and 3ds Max was used to build and optimize rendering of models，and functional development of virtual simulation training system of green Chinese onion combine harvester was completed by using virtual reality software Unity 3D.The virtual simulation training system had a good human-machine interaction interface，and was simple and practical for operation，could realize first person 3D scene roaming，interactive simulation of assembly and disassembly process，operation simulation，and has certain user and agricultural machinery management functions.This system could really immerse trainees，and play an important role in promoting training effect and increasing cognitive level of integration of agricultural machinery and techniques，and has a certain function of popularization and use.